# Webwire command-line Interface

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![webwire logo](https://webwire.dev/logo.svg)

Webwire is a **contract-first API system** which features an
interface description language a network protocol and
code generator for both servers and clients.

This repository contains the the **command-line interface** used
to validate Webwire IDL files and generate code and documentation.

To learn more about webwire in general please visit the documentation
repository [webwire/webwire-docs](https://github.com/webwire/webwire-docs).

# Example

The following example assumes a Rust server and a TypeScript client. Webwire
is by no means limited to those two but those languages show the potential of
webwire best.

Given the following IDL file:

```webwire
struct HelloRequest {
    name: String,
}

struct HelloResponse {
    message: String,
}

service Hello {
    hello: HelloRequest -> HelloResponse
}
```

The server and client files can be generated using the code generator:

```bash
$ webwire gen rust < api/chat.ww > server/src/api.rs
$ webwire gen ts < api/chat.ww > client/src/api.ts
```

A Rust server implementation for the given code would look like this:

```rust,ignore
use std::net::SocketAddr;
use std::sync::{Arc};

use async_trait::async_trait;

use ::api::chat;

use ::webwire::server::hyper::MakeHyperService;
use ::webwire::server::session::{Auth, AuthError};
use ::webwire::{Response, Router, Server, ConsumerError};

struct ChatService {
    #[allow(dead_code)]
    session: Arc<Session>,
    server: Arc<Server<Session>>,
}

#[async_trait]
impl chat::Server<Session> for ChatService {
    async fn send(&self, message: &chat::Message) -> Response<Result<(), chat::SendError>> {
        let client = chat::ClientConsumer(&*self.server);
        assert!(matches!(client.on_message(message).await, Err(ConsumerError::Broadcast)));
        Ok(Ok(()))
    }
}

#[derive(Default)]
struct Session {}

struct Sessions {}

impl Sessions {
    pub fn new() -> Self {
        Self {}
    }
}

#[async_trait]
impl webwire::SessionHandler<Session> for Sessions {
    async fn auth(&self, _auth: Option<Auth>) -> Result<Session, AuthError> {
        Ok(Session::default())
    }
    async fn connect(&self, _session: &Session) {}
    async fn disconnect(&self, _session: &Session) {}
}

#[tokio::main]
async fn main() {
    // Create session handler
    let session_handler = Sessions::new();

    // Create service router
    let router = Arc::new(Router::<Session>::new());

    // Create webwire server
    let server = Arc::new(webwire::server::Server::new(
        session_handler,
        router.clone(),
    ));

    // Register services
    router.service(chat::ServerProvider({
        let server = server.clone();
        move |session| ChatService {
            session,
            server: server.clone(),
        }
    }));

    // Start hyper service
    let addr = SocketAddr::from(([0, 0, 0, 0], 2323));
    let make_service = MakeHyperService { server };
    let server = hyper::Server::bind(&addr).serve(make_service);

    if let Err(e) = server.await {
        eprintln!("server error: {}", e);
    }
}
```

A TypeScript client using the generated code would look like that:

```typescript
import { Client } from 'webwire'
import api from 'api' // this is the generated code

let client = new Client('http://localhost:8000/', [
    api.chat.ClientProvider({
        async on_message(message) {
            console.log("Message received:", message)
        }
    })
])

assert(await client.connect())

let chat = api.chat.ServerConsumer(client)
let response = await chat.message({ text: "Hello world!" })

assert(response.Ok === null)
```

## License

Licensed under either of

- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0)>
- MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT)>

at your option.